On a Schottky diode-type hydrogen sensor with pyramid-like Pd nanostructures

Po Cheng Chou, Huey Ing Chen, I. Ping Liu, Wei Cheng Chen, Chun Chia Chen, Jian Kai Liou, Cheng Jing Lai, Wen Chau Liu

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Abstract A new Pd/AlGaN/GaN Schottky diode-type hydrogen sensor with pyramid-like Pd nanostructures is fabricated and studied comprehensively. The employed pyramid-like Pd nanostructures cause the substantial increase of surface roughness and surface-to-volume aspect ratio which give the remarkable increase of adsorption sites on the surface for hydrogen molecules. Experimentally, the studied device with pyramid-like Pd nanostructures demonstrates enhanced hydrogen sensing performance, including a large forward-bias current variation of 1.95 × 10-6 A and a high sensing response of 1454 under an introduced 1% H2/air gas at 300 K. These properties are remarkably superior to those of the conventional planar-surface device. In addition, an improved hydrogen detection limit of 10 ppb H2/air at 300 K is found for the studied device with pyramid-like Pd nanostructures. The related hydrogen sensing characteristics including transient responses and steady-state analysis are also studied in this work. Therefore, based on the improved sensing properties and advantages of low-cost, easy fabrication, and solid stability of operation, the studied device shows the promise for high-performance hydrogen sensing applications.

Original languageEnglish
Article number15920
Pages (from-to)9006-9012
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume40
Issue number29
DOIs
Publication statusPublished - 2015 Aug 3

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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